Cummins Diesel related emissions info. based on news and OEM updates. Most of the engine and Exhaust Aftertreatment pictures are from my own shop, actual failures or maintenance being completed on the Cummins 5.9L, 6.7L and 8.L ISB ISC ISL engines. Isuzu, FORD, GM. Diesel Exhaust Fluid related failures. DEF in Diesel Fuel failure.